Unlike some years back when sites were almost exclusively static, the standard today is to have a feature-rich, dynamic site. Not everybody can build this kind of site from scratch though, so the most convenient solution to have a dynamic website is to use a script application. A lot of website hosting providers offer script installers that can be used to add this kind of an application for any of your domain or subdomains, so you will not have to install anything manually. The main benefit of using an installer tool would be that the scripts are ready to use within a few minutes and the copy which will be installed is already with the settings necessary for it to run properly on the particular hosting web server, so you'll not need to change any script or account settings. In this way you can effortlessly create one with simply a couple of mouse clicks even if you have never had an Internet site before.